### Autogenous GrindingMining Fundamentals

Autogenous grinding is a process of grinding ore in a rotating cylinder using large pieces of the same ore Autogenous mills operate mechanically like ball mills however the media used for grinding differs Simply put in autogenous grinding the media is also the material that is being ground whereas in other milling methods steel or

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Keywords semi autogenous grinding mill lining modeling of lining wear processes factors of influence on the process of wear of lining 1 Introduction The process of destruction grinding and

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supported grinding mills up to the largest sizes SAG/ball mill circuit incorporating pebble crushers and a POLYCOM high pressure grinding roll SAG and ball mill for gold ore grinding One of three SAG mills with 9.75 m diameter and 2 x 4000 kW drive power These mills operate in conjunction with ball mills for iron ore grinding in Iran.

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semi autogenous grinding mill SAG mill is an operational unit where many problems may lurk A suitable overview of historical data should prove useful indeed Remes et al 2006 This study considers a novel process monitoring overview for a generic semi autogen ous grinding SAG mill

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Semi autogenous grinding mill largest Products As a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for any size reduction requirements including Semi autogenous grinding mill largest quarry aggregate and different kinds of minerals.

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SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer based modeling of charge motion in SAG mills and on established good design practice Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance i.e the impact of shell liners on the grinding action and of

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Autogenous AG Mills Fully autogenous and semi autogenous mills as aggregates for pre grinding of minerals and ores and grinding waste such as bulky refuse AG and SAG mills can be configured both for the dry grinding process and for the wet grinding process The bearings are hydrostatic trunnion bearings or slide shoe bearings.

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Since the early 1980s we have been designing and manufacturing Semi Autogenous SAG and Autogenous AG Grinding Mills under the Fuller Traylor brand Semi autogenous grinding uses a minimal ball charge in the range of 6 15 while autogenous grinding uses ore only SAG and AG Mills operate by lifting ore/grinding media and dropping it on the

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Semi autogenous Outotec SAG mills as they are often called can accomplish the same size reduction work as two or three stages of crushing and screening Often used in grinding at modern mineral processing plants SAG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.

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Introduction This tutorial describes how to set up and analyze a SAG Semi Autogenous Grinding mill simulation There are 12 short steps that will guide you throughout the tutorial The SAG Semi Autogenous Grinding mill is a machine designed to to grind

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A Load Interactive Model For Predicting The Performance Of Autogenous And Semi Autogenous Mills Predicting The Specific Energy Required For Size Reduction Of Relatively Coarse Feeds In Conventional Crushers And High Pressure Grinding Rolls A New Autogenous And Semi Autogenous Mill Model For Scale Up Design And Optimisation

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The designs of autogenous and semi autogenous SAG grindings mills are described followed by the description of their methods of operation in grinding circuits involving crushers and ball mills Methods of estimating SAG mill volumes mill charges feed size and power consumptions and optimum speeds of rotation during operation are described.

Get Price### Mill grinding Wikipedia Republished / WIKI 2

SAG is an acronym for semi autogenous grinding SAG mills are autogenous mills that also use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21 The largest SAG mill is 42 12.8m in

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a large effect on profitability Mill operators have long used operating work indices to evaluate grinding circuit efficiency with great utility Operating work indices can be used to evaluate individual units in a conventional circuit or the overall performance of an autogenous semiautogenous AG SAG /ball mill circuit but they are of

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SAG is an acronym for Semi Autogenous Grinding SAG mills are essentially autogenous mills but utilize grinding balls to aid in grinding like in a ball mill A SAG mill is generally used as a primary or first stage grinding solution Attrition between grinding balls and ore particles causes grinding of

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Mill Sizing After laboratory and pilot plant testing confirm the feasibility of autogenous or semi autogenous grinding it can be used to establish the exact grinding circuit and mill size.In the pilot plant tests the tare power of the pilot plant mills should be determined before and after each test run The tare power should be for the empty mill.

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The object of the study is a semi autogenous grinding mill SAG 34 17 the diameter of the mill is 34 feet the length is 17 feet which processes charges of copper–nickel ores The ores that make up the charge are divided into 3 conventional types For each type of

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Tumbling mills are main equipment of mineral industries These mills with a giant cylindrical configuration with the diameter of 10–12 m are used for the grinding of ores Semi autogenous grinding of ore plays a vital role in a mineral processing plant.

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Introduction This tutorial describes how to set up and analyze a SAG Semi Autogenous Grinding mill simulation There are 12 short steps that will guide you throughout the tutorial The SAG Semi Autogenous Grinding mill is a machine designed to to grind smaller particles and break larger rocks Particle breakage will not take place during this simulation The main focus is on

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As mined ore is typically less than 0.25 m in size.It is ground to a particle size of 80 passing 100 μm in a semi autogenous grinding mill then sent on to leaching using sulfuric acid and sulfur dioxide under atmospheric conditions.A schematic flowsheet of this part of the process is shown in Figure 30.4.

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A Semi autogenous SAG Mill utilizes steel balls in addition to the natural grinding media T he addition of balls typically 6 to 12 percent by mill volume o f 100 mm diameter or 125 mm diameter

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mills depends to a large extent on the design location and serviceability of lifters 2 Literature review Many researchers have investigated the processes of abrasing wear of the lining of the semi autogenous grinding mills and the impact of wear abrasing on the technical parameters of the milling process In work 9

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A semi autogenous grinding SAG mill is dependent on rotation to carry the grinding media around the mill for minerals impact and attrition as presented in Figure 1.It is an energy intensive unit operation and requires extremely wasteful equipment in terms of energy utilization and consumption.

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In modern mineral processing semi autogenous SAG mills are important grinding equipment A SAG mill has the advantages of high operation rate large output and large crushing ratio which makes SAG mills have the characteristics of short process time low management cost and suitability for large scale production compared to other mills.

Get Price### Wet Semi Autogenous Grinding Mills911 Metallurgist

Wet Semi Autogenous Grinding Mills The primary mill liner task force was formed in 1977 Its function was to improve the operating costs and milling efficiencies of the ten 8.2 m x 5.5 m 27 ft x 18 ft wet SAG mills that were operating at the time The SAG mills

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The primary control objective of the project is to achieve milling optimisation by ensuring that the energy available for rock breakage is used as efficiently as possible This is achieved by increasing the level of mill filing until a process constraint is reached Stable operation against this limiting constraint is then maintained to ensure long term optimised operation.Semi autogenous

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A Method of C alculating Autogenous Semi Autogenous Grinding Mill Specifi c Energies Using a Combination of Bond Work Indices and Julius Kruttschnitt Parameters then Applying Effi ciency Factors D Burgess1 ABSTRACT Since the days of mandatory high cost pilot plant testing in 6 ft 2 ft SAG mills autogenous

Get Price### What is the difference between a SAG mill and ball mill

Principle of SAG Mill operation SAG is an acronym for semi autogenous grinding SAG mills are autogenous mills that also use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21 6 7 The largest SAG mill is 42′ 12.8m in diameter powered by a 28 MW 38 000 HP

Get Price### Advanced Simulation for Semi Autogenous Mill Systems

Fig 1 Typical semi autogenous SAG mills This chapter presents a dynamic simulator of a semi autogenous grinding operation deduced from first principles coupled to an on line parameter estimation scheme able to simulate industrial operations for

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The transition from semi autogenous to autogenous milling at Waihi Gold C Haines and D Bertoldi AusIMM Mill Operators Conference 2016 ABSTRACT The Waihi Gold Mine WGM operated by OceanaGold New Zealand Limited is a wholly owned subsidiary of

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SAG mills semi autogenous milling is a type of grinding carried out with a small amount of ball charge and with the help of bigger parts crumbling the smaller parts of ore In addition to being preferred in gold copper platinum and silver mines SAG MILLS are preferred in

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Semi autogenous grinding SAG and autogenous grinding mills are used for grinding large chunks of materials into smaller pieces which can be later used for processing Such mills are used in the primary stage of grinding process where pieces of raw materials

Get Price### Semi autogenous grinding SAG mill liner design

SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer based modeling of charge motion in SAG mills and on established good design practice Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance i.e the impact of shell liners on the grinding action and of grates

Get Price### AMIT 135 Lesson 6 Grinding CircuitMining Mill

Semi Autogenous Grinding SAG Mill Wet or dry Higher capacity than A G mill grinding Primary coarse grinding up to 400 mm feed size Grinding media is grinding feed plus 4 12 ball charge ball dia.100 125 mm High capacity short retention time Less sensitive to feed composition critical size material Semi Autogenous Mill

Get Price### PDF Autogenous and Semi Autogenous Mills 2015 Update

A Semi autogenous SAG Mill utilizes steel balls in addition to the natural grinding media T he addition of balls typically 6 to 12 percent by mill volume o f 100 mm diameter or 125 mm diameter

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The first question that we at Allis Chalmers ask about the feasible application of primary autogenous or semi autogenous grinding mills concerns the quantity and the competency to be media of media sized ore in the feed These are the first factors to be appraised since if there is not enough media sized ore and/or if the media sized ore will

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A semi autogenous grinding SAG mill is dependent on rotation to carry the grinding media around the mill for minerals impact and attrition as presented in Figure 1 It is an energy intensive unit operation and requires extremely wasteful equipment in terms of energy utiliza

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internal mill volume hence the term SAG or semi autogenous grinding but can be as high as thirty per cent SAG mills with very high ball loads are not uncommon in some South African precious metal operations and are usually referred to as ROM ball mills Although semi autogenous grinding appears to be a very

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In SABC process when feeding the semi autogenous mill barrel continuously a certain amount of process water is also continuously fed to make the fine materials after grinding form a mixed fluid with water Under the effect of mixed fluid pressure difference the mixture is selectively separated by a grid plate In structure the grid plate

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Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency However it is industry practice to report mill load as the total output given by load cells or kPa for systems based on lubrication bearing back pressure rather than the actual percent total mill

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